What is the product? (negative 3 s + 2 t)(4 s minus t) negative 12 s squared minus 2 t squared negative 12 s squared + 2 t squared negative 12 s squared + 8 s t minus 2 t squared negative 12 s squared + 11 s t minus 2 t squared

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

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